私は背景画像を持つスライバアップバーを持っています。
折りたたまれたとき、背景として青い色があります。
しかし、青い色の代わりに私はそれが折りたたまれたときに背景画像を示すことを望みます。
どうやってこれを達成できますか?
私はすでにアプリバーに透明な背景色を与えようとしましたが、それはうまくいきませんでした。
コード:
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
var scrollController = ScrollController();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Home());
}
}
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: DefaultTabController(
length: 2,
child: NestedScrollView(
headerSliverBuilder:
(BuildContext context, bool innerBoxIsScrolled) {
return [
SliverAppBar(
expandedHeight: 200.0,
floating: false,
pinned: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&h=350",
fit: BoxFit.cover,
)),
),
SliverPadding(
padding: new EdgeInsets.all(16.0),
sliver: new SliverList(
delegate: new SliverChildListDelegate([
TabBar(
labelColor: Colors.black87,
unselectedLabelColor: Colors.grey,
tabs: [
new Tab(icon: new Icon(Icons.info), text: "Tab 1"),
new Tab(
icon: new Icon(Icons.lightbulb_outline),
text: "Tab 2"),
],
),
]),
),
),
];
},
body: Center(
child: Text("Sample text"),
),
),
));
}
}
_
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
var scrollController = ScrollController();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Home());
}
}
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: DefaultTabController(
length: 2,
child: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return [
SliverAppBar(
expandedHeight: 200.0,
floating: true,
pinned: true,
snap: true,
actionsIconTheme: IconThemeData(opacity: 0.0),
flexibleSpace: Stack(
children: <Widget>[
Positioned.fill(
child: Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&h=350",
fit: BoxFit.cover,
))
],
),
),
SliverPadding(
padding: new EdgeInsets.all(16.0),
sliver: new SliverList(
delegate: new SliverChildListDelegate([
TabBar(
labelColor: Colors.black87,
unselectedLabelColor: Colors.grey,
tabs: [
new Tab(icon: new Icon(Icons.info), text: "Tab 1"),
new Tab(
icon: new Icon(Icons.lightbulb_outline),
text: "Tab 2"),
],
),
]),
),
),
];
},
body: Center(
child: Text("Sample text"),
),
),
));
}
}
_